#include <QCoreApplication>
#include <iostream>
#include <math.h>
#define pi 3.14


using namespace std;

int main()
{
  float s,d,L;
       cout <<"Vvedite plosha S:";
       cin >>s;
       d=2*sqrt(s/pi);
       L=pi*d;
             cout <<"Diametr=" << d <<"\nDlina DUGI=" << L <<endl;





    return 0;
}
